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doi: 10.1038/s41467-024-45675-4 107 WalkeGGaurkarSSPrasadRLohakareTWanjariM

One can absolutely agree with the conclusion of the article by Jdrejko et al
doi: 10.1161/01.res.59.3.297

Therefore, if you have recently changed your diet, become vegan, and stopped consuming B12-rich foods, it may take several years for a deficiency to become apparent, and dietary supplementation might be an adequate solution over any need for B12 injections